Portal hypertension

Portal hypertension is an increase in pressure in the portal vein system. The portal vein is a confluence of the superior mesenteric and splenic veins, which draws blood from the gastrointestinal tract, spleen, and pancreas into the liver. The portal vein is divided into left and right branches in the hepatic portal, and it is distributed segmentally in the liver. The terminal microvenous blood and blood from the hepatic artery converge in the hepatic sinus, and then enter the inferior vena cava through the hepatic vein through the hepatic sinus.